OpenCart Update version 2.3.0.2.3 (online store of bed white

Fix errors of OpenCart version 2.3.0.2.3 (current online store of bed linen). To do this:
— restore the operability of the functionality used
— remove unnecessary modules and facilitate the administrative part of the site
— update the site to the current version of the OpenCart system 3.0 or higher
– check the compatibility of modules with OC 3.0 and replace incompatible ones with working analogues
– identify "crutches" and replace solutions with solutions that meet the requirements and standards of the system.

You need a developer who specializes in the OpenCart system, with experience in migrating between versions to perform the above work on a one-time basis.